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Dad's workouts may shape his child's endurance capacity and metabolic health.
Not by passing on mitochondria—which come from mom—but by sending tiny sperm microRNA messages that tune early embryonic gene regulation.
In a new study (mice), exercising fathers produced offspring with a higher VO2 max, greater endurance, a leaner body composition, and more mitochondria. They also had superior glucose control and insulin sensitivity when challenged with a high-fat diet.
Effects tracked to sperm small RNAs that suppressed a "molecular brake" on PGC-1α, the classic mitochondrial biogenesis switch.
This reframes preconception health as a two-parent story: mom supplies the mitochondria, but dad’s training status can still program how those mitochondria are used.

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